Hi, I am creating a taller header background image to 240px than the default header size of 140px. I also want change the default black background that is behind the header from it’s default size to 260 as well.

That helps. I want to make the black background image with more height (from 140 to 2xx). But because the bottom part of the image a scallop shape, I am not sure how lengthen it (give it more height) except to modify it in paint or photoshop, etc.